Astronomy:15 Aquarii

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Short description: Star in the constellation Aquarius
15 Aquarii
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  21h 18m 11.07309s[1]
Declination −04° 31′ 10.1276″[1]
Apparent magnitude (V) 5.83[2]
Characteristics
Spectral type B7 III[3] or B5 V[4]
B−V color index −0.130±0.005[2]
Astrometry
Radial velocity (Rv)−9.0±1.0[5] km/s
Proper motion (μ) RA: +12.11[6] mas/yr
Dec.: +12.94[6] mas/yr
Parallax (π)4.5632 ± 0.1345[1] mas
Distance710 ± 20 ly
(219 ± 6 pc)
Absolute magnitude (MV)−1.62[2]
Details
Mass5.7±0.2[7] M☉
Radius3.4[8] R☉
Luminosity821.67[2] L☉
Surface gravity (log g)3.84[9] cgs
Temperature14,318[9] K
Rotational velocity (v sin i)20[10] km/s
Age65.2±25.1[7] Myr
Other designations
BD−05° 5512, HD 202753, HIP 105164, HR 8141, SAO 145278[11]
Database references
SIMBADdata

15 Aquarii, abbreviated 15 Aqr, is a single,[12] blue-white star in the zodiac constellation of Aquarius. 15 Aquarii is the Flamsteed designation. It is a dim star that is just visible to the naked eye under good viewing conditions, having an apparent visual magnitude of 5.83.[2] Based upon an annual parallax shift of 4.6 mas,[1] it is located around 710 light years away. At that distance, the visual magnitude is diminished by an extinction of 0.18 due to interstellar dust.[13] It is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.[5] Relative to its neighbors, 15 Aqr has a peculiar velocity of 28.7+2.9
−3.1 km/s and may (62% chance) be a runaway star.[7]

Hube (1970) found a stellar classification of B7 III[3] for this star, which would suggest it is a B-type giant star. However, the Bright Star Catalogue (1964) listed it as a B-type main-sequence star with a class of B5 V,[4] and multiple sources use this instead.[7][10][8][9] The star is roughly 65[7] million years old with a projected rotational velocity of 20 km/s.[10] It has an estimated 5.7[7] times the mass of the Sun and about 3.4[8] times the Sun's radius. 15 Aquarii is radiating 822[2] times the Sun's luminosity from its photosphere at an effective temperature of 14,318 K.[9]

References

  1. ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended Hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 Hube, Douglas P. (1970), "The radial velocities of 335 late B-type stars", Memoirs of the Royal Astronomical Society 72: 233, Bibcode: 1970MmRAS..72..233H. 
  4. ↑ 4.0 4.1 Hoffleit, Dorrit (1964), Catalogue of Bright Stars (3rd revised ed.), New Haven, Conn.: Yale University Observatory, Bibcode: 1964cbs..book.....H. 
  5. ↑ 5.0 5.1 Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G. 
  6. ↑ 6.0 6.1 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Tetzlaff, N. et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T. 
  8. ↑ 8.0 8.1 8.2 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  9. ↑ 9.0 9.1 9.2 9.3 Takeda, Yoichi et al. (October 2010), "Oxygen and Neon Abundances of B-Type Stars in Comparison with the Sun", Publications of the Astronomical Society of Japan 62 (5): 1239–1248, doi:10.1093/pasj/62.5.1239, Bibcode: 2010PASJ...62.1239T. 
  10. ↑ 10.0 10.1 10.2 Strom, Stephen E. et al. (2005), "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?", The Astronomical Journal 129 (2): 809–828, doi:10.1086/426748, Bibcode: 2005AJ....129..809S. 
  11. ↑ "15 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=15+Aqr. 
  12. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  13. ↑ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters 38 (11): 694–706, doi:10.1134/S1063773712110035, Bibcode: 2012AstL...38..694G. 



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